Tube



W. H. FULTON.

TUBE. APPLICATION FILED MAY15, 1917.

- Patented Aug. 3, H20.

uni-TED STATES PATENT OFFICE. v

WILLIAM 1r FULTON, or mvmeron, new JERSEY, ASSIGNOR 'ro 'rrrEFLEx METALHOSE oonronarron, A ooaronarron or NEW YORK.

TU BE.

Specification of Letters Patent.

P atented Aug. 3, 1920.

' shall be of simple construction and require small expense tomanufacture, but which shall be strong, reliable and sufiiciently tightfor many purposes, for instance mufller tubes.

Other and ancillary objects of the invention will appear hereinafter.

In the accompanying drawings, whichillustrate the invention,-

Figure 1 is a perspective view of the initial flat ribbon or strip fromwhich the tube is formed;

Fig. 2 is a perspective view of the strip;

after having been formed to have a cross section so that 1t is suitablefor winding into the tube, and

Fig. 3 is a side elevation of the tube, par- I l tion of zigzag sectionadjacent the othertially in section;

' Fig. 4 is' a fragment showing in section a seam or joint havingpacking.

Referring to the drawings, a strip 1, of .brass,,steel or other materialof'flat, ribbonlike form as shown in .Fig. 1,.may have its sectionshaped in any suitablemanner into the form as shown in Fig. 2 whereinthe strip has a longitudinal center groove 2.

pon one side of the groove 2, is a groove 3 extending longitudinally ofthe 'strip, while upon the other side of the groove 2, is a 1011--gitudinally extending ortion comprising the parts at and 5 formed 1ntozigzag relation.

The strip of Fig. 2 may be coiled into a helix as by windin on amandrelto form a tube as shown in eiitered within the groove 3 at the adjacentedge of a contiguous convolution, so as to seig. 3. The zigzag portionadjacent the edge of one convolution is which is tight for manypurposes, is secured. It may further be observed that in the structureshown, the different element of 4:. and 5 of the zigzag portion, extendfrom one side of the groove 3 to the other, so that the convolutionedges are held from relative movement longitudinally of the tube.

- If desired, a packing strip indicated in section at 6 in Fig. 4, maybe wound within the groove 3 between its bottom and the edge of thezigzag shaped portion. This will enhance the tightness of the tube Whereit is retrvired.

hile one manner of forming the tube has been stated, it might be formedby other methods.

- While the invention has been illustrated in What is considered itsbest application, it

may have other embodiments without departing from'its spirit and is nottherefore limited to the structure shown in the drawstrip havingalongitu 'nal groove adjacent.

one edge and a longitudinally extending portively reflexed portionsoverlying each other radiallyof the tube.

2. A tube comprising a helically disposed I strip having a centrallongitudinal groove;

' a longitudinal, groove upon one side of the aforesaid groove and alongitudinally extending, portion of zigzag section upon the 7 otherside of the central longitudinal groove,

the said portion of zigzag sectionbeing within the groove upon the otherside of the said central groove and having its relatively reflexedportions overlying each other radially of the tube.

3. A tube comprising a helically disposed strip having a longitudinalgroove adjacent one edge and a longitudinally extending portion ofzigzag section adjacent the other edge,the said portion of zigzagsection being within said groove and havin its outer edge pressingagainst the inner we 1 of the groove by the spring of the metal in thezigzag portion. Y

4. A tube comprisin a helically disposed strip having a longituinal-groove adjacent said portion and the walls 0 one ed e and alongitudinally extending portion -0 zigzag section adjacent the otheredge, the said portion of zi zag section being within the said groove anhaving its relatively reflexed portions overlying each other radially ofthe tube; and a packing between said groove. 5. A tube oomprisin .ahelically disposed strip having a longitu inal groove adjacent one edgeand a longitudinally extending por- 1o tion of zigzag section adjacentthe other H edge, the said portion of zigza section being within saidgroove and the e ements of the said zigzag eachextending from one wallof said groove to another. 15 In testimony whereof I have signed thisspecification this 14th day of May, 1917.

WILLIAM H. FULTON.

